diff --git a/zcutil/cleanup-tags.sh b/zcutil/cleanup-tags.sh
new file mode 100755
index 000000000..0d01d2d63
--- /dev/null
+++ b/zcutil/cleanup-tags.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+#
+# Warning: This deletes tags on "origin", so point that at the right target!
+#
+# Note: It doesn't delete any local tags.
+
+set -exu -o pipefail
+
+ZCASH_TAG_RGX='^v[0-9]+.[0-9]+.[0-9]+.z[0-9]+'
+MAXJOBS=7
+
+i=0
+
+for nonzctag in $(git ls-remote origin \
+                         | grep refs/tags/ \
+                         | grep -v '\^{}$' \
+                         | sed 's,^.*refs/tags/,,'\
+                         | grep -Ev "$ZCASH_TAG_RGX"
+                 )
+do
+    git push origin ":refs/tags/${nonzctag}" &
+    i="$(expr "$i" + 1)"
+    [ "$i" -ge "$MAXJOBS" ] && wait -n
+done
+
+wait